\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{circuitikz}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes}
\ctikzset{bipoles/length=1cm}
\begin{document}
\small
\begin{circuitikz}[>=latex, scale=0.7,european]
  % \useasboundingbox(0.9,0)rectangle(5.1,5);
  \draw (0,0) to [R=$2$, *-*] (-30:3) ;
  \draw (0,0) to [R=$3$, *-*] (-150:3);
  \draw (0,0) to [R=$1$] (0,3);
  \draw (0,3)--(-6,3)node[left]{$A$};
  \draw (-150:3)--(-6,-1.5)node[left]{$C$};
  \draw (-30:3)--++(0,-1.5)--(-6,-3)node[left]{$B$};
  \draw (0,0)node[above right]{$O'$}--(-6,0)node[left]{$O$};
  \foreach \x in {0,3,-1.5,-3}
  {
      \draw [fill=white] (-6,\x) circle (3pt);
  }
  \draw [<->] (-5,0)--node[fill=white]{$U_{\text{相}}$}(-5,3);
  \draw [->](-5,3)--(-4,3) node [above]{$I_{\text{线}}$};
  \draw [->](0,3)--(0,2.5) node [right]{$I_{\text{相}}$};
\end{circuitikz}
\end{document}